Deprecate most of gaia_auth extension

chrome/browser/resources/gaia_auth_host/saml_injected.js

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * @fileoverview
  * Script to be injected into SAML provider pages, serving three main purposes:
  * 1. Signal hosting extension that an external page is loaded so that the
  *    UI around it should be changed accordingly;
  * 2. Provide an API via which the SAML provider can pass user credentials to
@@ skipping 198 matching lines @@
   }
 
   var channel = Channel.create();
   channel.connect('injected');
   channel.sendWithCallback({name: 'getSAMLFlag'},
                            onGetSAMLFlag.bind(undefined, channel));
 
   var apiCallForwarder = new APICallForwarder();
   apiCallForwarder.init(channel);
 })();